diff --git a/app/src/main/java/org/schabi/newpipe/database/subscription/SubscriptionEntity.java b/app/src/main/java/org/schabi/newpipe/database/subscription/SubscriptionEntity.java
index 567bec309..12d1764cc 100644
--- a/app/src/main/java/org/schabi/newpipe/database/subscription/SubscriptionEntity.java
+++ b/app/src/main/java/org/schabi/newpipe/database/subscription/SubscriptionEntity.java
@@ -7,6 +7,7 @@ import android.arch.persistence.room.Index;
 import android.arch.persistence.room.PrimaryKey;
 
 import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
+import org.schabi.newpipe.util.Constants;
 
 import static org.schabi.newpipe.database.subscription.SubscriptionEntity.SUBSCRIPTION_SERVICE_ID;
 import static org.schabi.newpipe.database.subscription.SubscriptionEntity.SUBSCRIPTION_TABLE;
@@ -28,7 +29,7 @@ public class SubscriptionEntity {
     private long uid = 0;
 
     @ColumnInfo(name = SUBSCRIPTION_SERVICE_ID)
-    private int serviceId = -1;
+    private int serviceId = Constants.NO_SERVICE_ID;
 
     @ColumnInfo(name = SUBSCRIPTION_URL)
     private String url;
diff --git a/app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java b/app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java
index 5f954cad2..4bb0c2cca 100644
--- a/app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java
+++ b/app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java
@@ -65,6 +65,7 @@ import org.schabi.newpipe.player.PopupVideoPlayer;
 import org.schabi.newpipe.player.old.PlayVideoActivity;
 import org.schabi.newpipe.report.ErrorActivity;
 import org.schabi.newpipe.report.UserAction;
+import org.schabi.newpipe.util.Constants;
 import org.schabi.newpipe.util.ExtractorHelper;
 import org.schabi.newpipe.util.InfoCache;
 import org.schabi.newpipe.util.ListHelper;
@@ -110,7 +111,7 @@ public class VideoDetailFragment extends BaseStateFragment<StreamInfo> implement
     private boolean wasRelatedStreamsExpanded = false;
 
     @State
-    protected int serviceId = -1;
+    protected int serviceId = Constants.NO_SERVICE_ID;
     @State
     protected String name;
     @State
diff --git a/app/src/main/java/org/schabi/newpipe/fragments/list/BaseListInfoFragment.java b/app/src/main/java/org/schabi/newpipe/fragments/list/BaseListInfoFragment.java
index 34fcaf873..4baf323ff 100644
--- a/app/src/main/java/org/schabi/newpipe/fragments/list/BaseListInfoFragment.java
+++ b/app/src/main/java/org/schabi/newpipe/fragments/list/BaseListInfoFragment.java
@@ -8,6 +8,7 @@ import android.view.View;
 
 import org.schabi.newpipe.extractor.ListExtractor;
 import org.schabi.newpipe.extractor.ListInfo;
+import org.schabi.newpipe.util.Constants;
 
 import java.util.Queue;
 
@@ -21,7 +22,7 @@ import io.reactivex.schedulers.Schedulers;
 public abstract class BaseListInfoFragment<I extends ListInfo> extends BaseListFragment<I, ListExtractor.NextItemsResult> {
 
     @State
-    protected int serviceId = -1;
+    protected int serviceId = Constants.NO_SERVICE_ID;
     @State
     protected String name;
     @State
diff --git a/app/src/main/java/org/schabi/newpipe/fragments/list/search/SearchFragment.java b/app/src/main/java/org/schabi/newpipe/fragments/list/search/SearchFragment.java
index 93ac00207..db036859e 100644
--- a/app/src/main/java/org/schabi/newpipe/fragments/list/search/SearchFragment.java
+++ b/app/src/main/java/org/schabi/newpipe/fragments/list/search/SearchFragment.java
@@ -41,6 +41,7 @@ import org.schabi.newpipe.extractor.search.SearchResult;
 import org.schabi.newpipe.fragments.list.BaseListFragment;
 import org.schabi.newpipe.history.HistoryListener;
 import org.schabi.newpipe.report.UserAction;
+import org.schabi.newpipe.util.Constants;
 import org.schabi.newpipe.util.ExtractorHelper;
 import org.schabi.newpipe.util.NavigationHelper;
 import org.schabi.newpipe.util.StateSaver;
@@ -86,7 +87,7 @@ public class SearchFragment extends BaseListFragment<SearchResult, ListExtractor
     private SearchEngine.Filter filter = SearchEngine.Filter.ANY;
 
     @State
-    protected int serviceId = -1;
+    protected int serviceId = Constants.NO_SERVICE_ID;
     @State
     protected String searchQuery = "";
     @State
diff --git a/app/src/main/java/org/schabi/newpipe/util/Constants.java b/app/src/main/java/org/schabi/newpipe/util/Constants.java
index f9329b0be..b31a95cca 100644
--- a/app/src/main/java/org/schabi/newpipe/util/Constants.java
+++ b/app/src/main/java/org/schabi/newpipe/util/Constants.java
@@ -9,4 +9,6 @@ public class Constants {
     public static final String KEY_QUERY = "key_query";
 
     public static final String KEY_THEME_CHANGE = "key_theme_change";
+
+    public static final int NO_SERVICE_ID = -1;
 }
diff --git a/app/src/main/java/org/schabi/newpipe/util/ExtractorHelper.java b/app/src/main/java/org/schabi/newpipe/util/ExtractorHelper.java
index 5cf9f057e..0dd2c00ab 100644
--- a/app/src/main/java/org/schabi/newpipe/util/ExtractorHelper.java
+++ b/app/src/main/java/org/schabi/newpipe/util/ExtractorHelper.java
@@ -50,7 +50,14 @@ public final class ExtractorHelper {
         //no instance
     }
 
+    private static void checkServiceId(int serviceId) {
+        if(serviceId == Constants.NO_SERVICE_ID) {
+            throw new IllegalArgumentException("serviceId is NO_SERVICE_ID");
+        }
+    }
+
     public static Single<SearchResult> searchFor(final int serviceId, final String query, final int pageNumber, final String searchLanguage, final SearchEngine.Filter filter) {
+        checkServiceId(serviceId);
         return Single.fromCallable(new Callable<SearchResult>() {
             @Override
             public SearchResult call() throws Exception {
@@ -61,6 +68,7 @@ public final class ExtractorHelper {
     }
 
     public static Single<NextItemsResult> getMoreSearchItems(final int serviceId, final String query, final int nextPageNumber, final String searchLanguage, final SearchEngine.Filter filter) {
+        checkServiceId(serviceId);
         return searchFor(serviceId, query, nextPageNumber, searchLanguage, filter)
                 .map(new Function<SearchResult, NextItemsResult>() {
                     @Override
@@ -71,6 +79,7 @@ public final class ExtractorHelper {
     }
 
     public static Single<List<String>> suggestionsFor(final int serviceId, final String query, final String searchLanguage) {
+        checkServiceId(serviceId);
         return Single.fromCallable(new Callable<List<String>>() {
             @Override
             public List<String> call() throws Exception {
@@ -80,6 +89,7 @@ public final class ExtractorHelper {
     }
 
     public static Single<StreamInfo> getStreamInfo(final int serviceId, final String url, boolean forceLoad) {
+        checkServiceId(serviceId);
         return checkCache(forceLoad, serviceId, url, Single.fromCallable(new Callable<StreamInfo>() {
             @Override
             public StreamInfo call() throws Exception {
@@ -89,6 +99,7 @@ public final class ExtractorHelper {
     }
 
     public static Single<ChannelInfo> getChannelInfo(final int serviceId, final String url, boolean forceLoad) {
+        checkServiceId(serviceId);
         return checkCache(forceLoad, serviceId, url, Single.fromCallable(new Callable<ChannelInfo>() {
             @Override
             public ChannelInfo call() throws Exception {
@@ -98,6 +109,7 @@ public final class ExtractorHelper {
     }
 
     public static Single<NextItemsResult> getMoreChannelItems(final int serviceId, final String url, final String nextStreamsUrl) {
+        checkServiceId(serviceId);
         return Single.fromCallable(new Callable<NextItemsResult>() {
             @Override
             public NextItemsResult call() throws Exception {
@@ -107,6 +119,7 @@ public final class ExtractorHelper {
     }
 
     public static Single<PlaylistInfo> getPlaylistInfo(final int serviceId, final String url, boolean forceLoad) {
+        checkServiceId(serviceId);
         return checkCache(forceLoad, serviceId, url, Single.fromCallable(new Callable<PlaylistInfo>() {
             @Override
             public PlaylistInfo call() throws Exception {
@@ -116,6 +129,7 @@ public final class ExtractorHelper {
     }
 
     public static Single<NextItemsResult> getMorePlaylistItems(final int serviceId, final String url, final String nextStreamsUrl) {
+        checkServiceId(serviceId);
         return Single.fromCallable(new Callable<NextItemsResult>() {
             @Override
             public NextItemsResult call() throws Exception {
@@ -133,6 +147,7 @@ public final class ExtractorHelper {
      * and put the results in the cache.
      */
     private static <I extends Info> Single<I> checkCache(boolean forceLoad, int serviceId, String url, Single<I> loadFromNetwork) {
+        checkServiceId(serviceId);
         loadFromNetwork = loadFromNetwork.doOnSuccess(new Consumer<I>() {
             @Override
             public void accept(@NonNull I i) throws Exception {
@@ -157,6 +172,7 @@ public final class ExtractorHelper {
      * Default implementation uses the {@link InfoCache} to get cached results
      */
     public static <I extends Info> Maybe<I> loadFromCache(final int serviceId, final String url) {
+        checkServiceId(serviceId);
         return Maybe.defer(new Callable<MaybeSource<? extends I>>() {
             @Override
             public MaybeSource<? extends I> call() throws Exception {